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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:84)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:72)	at org.eclipse.jface.viewers.StructuredViewer.assertElementsNotNull(StructuredViewer.java:580)	at org.eclipse.jface.viewers.StructuredViewer.getRawChildren(StructuredViewer.java:938)	at org.eclipse.jface.viewers.ColumnViewer.getRawChildren(ColumnViewer.java:693)	at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1298)	at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:378)	at org.eclipse.jface.viewers.AbstractTreeViewer.getFilteredChildren(AbstractTreeViewer.java:615)	at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:581)	at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:778)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)	at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:755)	at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:627)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1551)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1548)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1548)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpand(AbstractTreeViewer.java:1548)	at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget(AbstractTreeViewer.java:2393)	at org.eclipse.ui.navigator.CommonViewer.setSelectionToWidget(CommonViewer.java:337)	at org.eclipse.jface.viewers.AbstractTreeViewer.setSelectionToWidget(AbstractTreeViewer.java:2780)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1375)	at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:390)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1330)	at org.eclipse.jface.viewers.AbstractTreeViewer.inputChanged(AbstractTreeViewer.java:1435)	at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:251)	at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1606)	at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider$1.propertyChange(WorkingSetActionProvider.java:145)	at org.eclipse.ui.actions.WorkingSetFilterActionGroup.firePropertyChange(WorkingSetFilterActionGroup.java:250)	at org.eclipse.ui.actions.WorkingSetFilterActionGroup.setWorkingSet(WorkingSetFilterActionGroup.java:237)	at org.eclipse.ui.internal.WorkingSetMenuContributionItem$1.widgetSelected(WorkingSetMenuContributionItem.java:82)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3319)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)	at org.eclipse.equinox.launcher.Main.run(Main.java:1173)